The Collaborative International Dictionary
Demonomagy
Demonomagy \De`mon*om"a*gy\, n. [Gr. dai`mwn demon + magei`a
magic.]
Magic in which the aid of demons is invoked; black or
infernal magic.
--Bp. Hurd.
Wiktionary
demonomagy
n. (context rare English) magic in which the aid of demons is invoked; black magic.